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Class methods can be overloaded as well as the usual functions. This is especially handy if you need to make a few constructors that will take different parameters.

For example, let’s try to create a foundation class decimal which implements long arithmetic for numbers of arbitrary precision. In such cases, the number is typically stored within a row, and mathematical operations logic is implemented by writing corresponding operators.

Let’s make a class constructor which can take both the line and the number of the type double as parameters.

```// string
decimal num1("10000000.999999");
// number
decimal num2(10000.0);
```

In order to support the universality, we will do two different constructors for strings and numbers:

```class decimal
{
public:
// string constructor
decimal(string number)
{
clog &lt;&lt; "First constructor called\n";
}

// double constructor
decimal(double number)
{
clog &lt;&lt; "Second constructor called\n";
}

private:
string number;
};
```

If we will use the line it will call the first constructor, if we input the number it will use the second one.

The full text of the program:

```#include &lt;iostream&gt;
#include &lt;string&gt;

using namespace std;

class decimal
{
public:

decimal(string number)
{
clog &lt;&lt; "First constructor called\n"; this-&gt;number = number;
}

decimal(double number)
{

clog &lt;&lt; "Second constructor called\n";
}

private:
string number;
};

int main()
{

decimal num1("10000000.999999");

decimal num2(10000.0);
cin.get();
return 0;
}
```

The result of the program: